nigricans, Arius Valenciennes [A.] 1834:Pl. 3 (fig. 3) [Voyage dans l'Amérique méridionale; ref. 20720] Río de la Plata, Montevideo, Uruguay. Holotype (unique): MNHN 0000-0176 (poor condition). Type catalog: Bertin & Estève 1950:54 [ref. 19575], Ferraris 2007:54 [ref. 29155] Name available from plate, also in Valenciennes 1847:6 [ref. 5010]. Pl. 3 was published in 1834. See also Cuvier & Valenciennes 1840:83 [ref. 1008]. •Species inquirenda in Arridae -- (Marceniuk & Ferraris in Reis et al. 2003:453 [ref. 27061]). •Species inquirenda in Genidens -- (Marceniuk & Menezes 2007:67 [ref. 29031]). •Species inquirenda in Ariidae -- (Ferraris 2007:54 [ref. 29155]). •Synonym of Cathorops spixii (Agassiz 1829) -- (Marceniuk et al. 2012:87 [ref. 31865]). Current status: Synonym of Cathorops spixii (Agassiz 1829). Ariidae: Ariinae. Habitat: freshwater, brackish, marine.